<?php

/**
 * https://www.runoob.com/sql/sql-update.html
 * SELECT LastName,FirstName FROM Persons
 *
 * INSERT INTO Persons VALUES ('Gates', 'Bill', 'Xuanwumen 10', 'Beijing')
 *
 * DELETE FROM Websites
WHERE name='百度' AND country='CN';
 *
 * UPDATE Websites
SET alexa='5000', country='USA'
WHERE name='菜鸟教程';
 *
 * CREATE TABLE Persons
(
PersonID int,
LastName varchar(255),
FirstName varchar(255),
Address varchar(255),
City varchar(255)
);
 *
 *

 */
class sql语句
{

}